Who is using their DAC as a preamp?

And yes, that is the preamp I have.

The one for sale on there is a dealer demo from Audio Archon, one of their dealers.

No idea what you mean by “already??”

I used my Bricasti M1 DAC as a volume control so no need for me to add a preamplifier. My amps are the Bricasti M28's and the sound is stunning. However if someone felt that their solid state amp was a little to harsh they might want to mellow it out with a preamplifier. 

However if someone felt that their solid state amp was a little to harsh they might want to mellow it out with a preamplifier.

Yes this is what they’re good for, a tube pre "maybe" to mellow, and many solid state ones that can add some "etching" (focusing).

A passive is about as close to neutral you can get so long as impedance matched.

And direct (no preamp) is the ultimate in transparency, like a straight wire, but if you don’t like it, you don’t like the sound of your source. And need one or the other active preamps to colour it.

BTW "impedance matching", goes for actives "almost’ as much as passives do.

Cheers George

George, if you look further down on the Douk page of the device, in the specification section, it states that the Alps 27 pot is 50K ohms. I have not taken mine apart, which would be easy, but I am telling you, it sounds quite invisible.
https://www.ebay.com.au/itm/Douk-Audio-High-Precision-Passive-Preamp-Volume-Controller-HiFi-Pre-Amplifiers/253818627052?hash=item3b18c4e3ec:m:mFApKB2238-vYIZZSg26Ehg&frcectupt=true

This one actually shows a 50kohm motorized pot not 100kohm, but a 10kohm would still be the best to match up with a lot more amps and sources.
But this one is motorized but no remote or power input or receiver, I have no idea what these guys are into, and I don't think they do either.
https://www.ebay.com.au/itm/FV3-passive-preamp-HIFI-volume-controller-ALPS-RK168-FOR-amplifier-NEW-VERSION-/143178261198?_trksid=p2385738.m4383.l4275.c10

Cheers George